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liuml07/std::string::starts_with.cpp

Last active February 1, 2019 08:28
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The missing std::string::starts_with(string)
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std::string::starts_with.cpp
inline bool starts_with(const string &big_str, const string &small_str) {
return big_str.compare(0, small_str.length(), small_str) == 0;
}
@Liam0205
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#include <string>
namespace std {
template <typename charT>
inline bool starts_with(const basic_string<charT>& big, const basic_string<charT>& small) {
    const typename basic_string<charT>::size_type big_size = big.size();
    const typename basic_string<charT>::size_type small_size = small.size();
    const bool valid_ = (big_size >= small_size);
    const bool starts_with_ = (big.compare(0, small_size, small) == 0);
    return valid_ and starts_with_;
}

template <typename charT>
inline bool ends_with(const basic_string<charT>& big, const basic_string<charT>& small) {
    const typename basic_string<charT>::size_type big_size = big.size();
    const typename basic_string<charT>::size_type small_size = small.size();
    const bool valid_ = (big_size >= small_size);
    const bool ends_with_ = (big.compare(big_size - small_size, small_size, small) == 0);
    return valid_ and ends_with_;
}
}  // namespace std

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